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v2.4.1.9

Statements of Changes in Partners' Capital (USD $) | Total | General Partner [Member] | Limited Partners
--- | --- | --- | ---
Beginning Balances at Dec. 31, 2014 | $ 37,232,925 us-gaap_PartnersCapital | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 37,232,925 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, beginning of period at Dec. 31, 2014 | $ 26.59 usl_NetAssetValuePerUnit |  |
Addition of 1,600,000 partnership shares | 39,864,429 us-gaap_PartnersCapitalAccountContributions | 0 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | 39,864,429 us-gaap_PartnersCapitalAccountContributions / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net income (loss) | (5,217,256)us-gaap_NetIncomeLoss | 0 us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | (5,217,256)us-gaap_NetIncomeLoss / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Ending Balances at Mar. 31, 2015 | $ 71,880,098 us-gaap_PartnersCapital | $ 0 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_GeneralPartnerMember | $ 71,880,098 us-gaap_PartnersCapital / us-gaap_PartnerCapitalComponentsAxis = us-gaap_LimitedPartnerMember
Net asset value, end of period at Mar. 31, 2015 | $ 23.96 usl_NetAssetValuePerUnit |  |

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